package com.ohuang.crashhandler;

import java.io.File;
import java.io.FileOutputStream;
import java.io.PrintWriter;
import java.io.StringWriter;
import java.io.Writer;
import java.lang.Thread.UncaughtExceptionHandler;
import java.lang.reflect.Field;
import java.text.DateFormat;
import java.text.SimpleDateFormat;
import java.util.Date;
import java.util.HashMap;
import java.util.Map;

import android.content.ComponentName;
import android.content.Context;
import android.content.Intent;
import android.content.pm.PackageInfo;
import android.content.pm.PackageManager;
import android.content.pm.PackageManager.NameNotFoundException;
import android.os.Build;
import android.os.Environment;
import android.os.Handler;
import android.os.Looper;
import android.util.Log;
import android.widget.Toast;

/**
 * UncaughtException处理类,当程序发生Uncaught异常的时候,有该类来接管程序,并记录发送错误报告.
 */

public class CrashHandler implements UncaughtExceptionHandler {
    public static final String TAG = "CrashHandler";
    //系统默认的UncaughtException处理类
    private Thread.UncaughtExceptionHandler mDefaultHandler;


    //CrashHandler实例
    private static CrashHandler INSTANCE = new CrashHandler();
    //程序的Context对象
    private Context mContext;
    //用来存储设备信息和异常信息
    private Map<String, String> infos = new HashMap<String, String>();

    private boolean handleExceptionReturn = true;


    //用于格式化日期,作为日志文件名的一部分
    private DateFormat formatter = new SimpleDateFormat("yyyy_MMdd_HH_mm_ss");

    //保证只有一个CrashHandler实例
    private CrashHandler() {
        //构造函数
    }

    //获取CrashHandler实例,单例模式
    public static CrashHandler getInstance() {
        return INSTANCE;
    }

    /**
     * 初始化
     *
     * @param context
     */
    public void init(Context context) {
        if (mContext == null) {
            mContext = context;
            //获取系统默认的UncaughtException处理器
            mDefaultHandler = Thread.getDefaultUncaughtExceptionHandler();
            //设置该CrashHandler为程序的默认处理器
            Thread.setDefaultUncaughtExceptionHandler(this);
        } else {
            Thread.setDefaultUncaughtExceptionHandler(this);
        }
    }

    /**
     * 禁用 crashLog启动图标   千万不要在 :crashHandler子进程中调用该方法
     *
     * @param disable ture禁用  false启用
     */
    public void disableLauncher(boolean disable) {
        if (disable) {
            mContext.getPackageManager().setComponentEnabledSetting(
                    new ComponentName(mContext, "com.ohuang.crashhandler.CrashListActivity"),
                    PackageManager.COMPONENT_ENABLED_STATE_DISABLED,
                    PackageManager.DONT_KILL_APP
            );
        } else {
            mContext.getPackageManager().setComponentEnabledSetting(
                    new ComponentName(mContext, "com.ohuang.crashhandler.CrashListActivity"),
                    PackageManager.COMPONENT_ENABLED_STATE_ENABLED,
                    PackageManager.DONT_KILL_APP
            );
        }
    }

    public boolean isHandleExceptionReturn() {
        return handleExceptionReturn;
    }

    /**
     * 是否继续交给系统处理
     * false 继续交给系统处理
     * true 自己处理  传入Runnable处理
     *
     * @param handleExceptionReturn
     */
    public void setHandleExceptionReturn(boolean handleExceptionReturn) {
        this.handleExceptionReturn = handleExceptionReturn;
    }

    /**
     * 当UncaughtException发生时会转入该函数来处理
     */
    @Override
    public void uncaughtException(Thread thread, Throwable ex) {
        if (!handleException(ex) && mDefaultHandler != null) {
            //如果用户没有处理则让系统默认的异常处理器来处理
            mDefaultHandler.uncaughtException(thread, ex);
        } else {
            new Thread() {
                @Override
                public void run() {
                    Looper.prepare();
                    Toast.makeText(mContext, "很抱歉,应用出现异常,即将退出！", Toast.LENGTH_LONG).show();
                    Looper.loop();
                }
            }.start();
            try {
                Thread.sleep(3000);
            } catch (InterruptedException e) {
                Log.e(TAG, "error : ", e);
            }

            //退出程序
            android.os.Process.killProcess(android.os.Process.myPid());
            System.exit(1);
        }
    }

    public String getLogPath() {
        return mContext.getFilesDir().getAbsolutePath() + "/crashLog/";
    }


    /**
     * 自定义错误处理,收集错误信息 发送错误报告等操作均在此完成.
     *
     * @param ex
     * @return true:如果处理了该异常信息;否则返回false.
     */
    private boolean handleException(Throwable ex) {
        if (ex == null) {
            return false;
        }

        //使用Toast来显示异常信息

        //收集设备参数信息
        collectDeviceInfo(mContext);
        //保存日志文件
        String fileName = saveCrashInfo2File(ex);
        if (fileName != null) {
            startLogActivity(fileName);
        }
        return handleExceptionReturn;
    }

    private Handler handler = new Handler(Looper.getMainLooper());

    private void startLogActivity(String fileName) {
        if (Looper.myLooper() == Looper.getMainLooper()) {
            Toast.makeText(mContext, "程序发生异常,请查看日志", Toast.LENGTH_SHORT).show();
            Intent intent = new Intent(mContext, CrashLogActivity.class);
            intent.putExtra("filename", fileName);
            intent.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
            mContext.startActivity(intent);
        } else {
            handler.post(new Runnable() {

                @Override
                public void run() {
                    Toast.makeText(mContext, "程序发生异常,请查看日志", Toast.LENGTH_SHORT).show();
                    Intent intent = new Intent(mContext, CrashLogActivity.class);
                    intent.putExtra("filename", fileName);
                    intent.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
                    mContext.startActivity(intent);
                }
            });
        }


    }

    /**
     * 收集设备参数信息
     *
     * @param ctx
     */
    public void collectDeviceInfo(Context ctx) {
        try {
            PackageManager pm = ctx.getPackageManager();
            PackageInfo pi = pm.getPackageInfo(ctx.getPackageName(), PackageManager.GET_ACTIVITIES);
            if (pi != null) {
                String versionName = pi.versionName == null ? "null" : pi.versionName;
                String versionCode = pi.versionCode + "";
                infos.put("versionName", versionName);
                infos.put("versionCode", versionCode);
            }
        } catch (NameNotFoundException e) {
            Log.e(TAG, "an error occured when collect package info", e);
        }
        Field[] fields = Build.class.getDeclaredFields();
        for (Field field : fields) {
            try {
                field.setAccessible(true);
                infos.put(field.getName(), field.get(null).toString());
                Log.d(TAG, field.getName() + " : " + field.get(null));
            } catch (Exception e) {
                Log.e(TAG, "an error occured when collect crash info", e);
            }
        }
    }

    /**
     * 保存错误信息到文件中
     *
     * @param ex
     */
    private String saveCrashInfo2File(Throwable ex) {
        StringBuffer sBuffer = new StringBuffer();


        Writer writer = new StringWriter();
        PrintWriter printWriter = new PrintWriter(writer);
        ex.printStackTrace(printWriter);
        Throwable cause = ex.getCause();
        while (cause != null) {
            cause.printStackTrace(printWriter);
            cause = cause.getCause();
        }
        printWriter.close();
        String result = writer.toString();
        sBuffer.append(result);
        sBuffer.append("  \n");
        for (Map.Entry<String, String> entry : infos.entrySet()) {
            String key = entry.getKey();
            String value = entry.getValue();
            sBuffer.append("  " + key + "=" + value + "\n");
        }
        String fileName = null;
        try {
            long timestamp = System.currentTimeMillis();
            String currTime = formatter.format(new Date());
            fileName = "crash_" + currTime + "_" + (timestamp % 1000) + ".txt";

            String path = mContext.getFilesDir().getAbsolutePath() + "/crashLog/";
            File dir = new File(path);
            if (!dir.exists()) {
                dir.mkdirs();
            }

            FileOutputStream foStream = new FileOutputStream(path + fileName);
            foStream.write(sBuffer.toString().getBytes());
            foStream.close();

        } catch (Exception e) {
            Log.e(TAG, "an error occured while writing file...", e);
        }
        return fileName;
    }
}
